Feature #5994: Dir.glob without wildcards returns pattern, not filename - Ruby master - Ruby Issue Tracking System

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Feature #5994

closed

Dir.glob without wildcards returns pattern, not filename

Added by daz (Dave B) about 12 years ago. Updated almost 10 years ago.

Status:

Closed

Assignee:

nobu (Nobuyoshi Nakada)

Target version:

2.2.0

[ruby-core:42469]

Description

This is Windows specific, I guess, as filename case doesn't matter there.
Ruby version is not specific to 1.9.3p0 (ruby 1.8.7p334 gives the same).
The script below produces results that seem inconsistent.
Using special characters (wildcards) in the glob pattern returns the
actual filename on disk but a plain pattern (no wildcards) returns the
pattern itself. This means I have to use another method for producing
a file with the same name or else override the users case-style
preference (which is not my intention).

daz

#======================
puts 'ruby %sp%d (%s) [%s]' % [RUBY_VERSION, RUBY_PATCHLEVEL, RUBY_RELEASE_DATE, RUBY_PLATFORM]
# ruby 1.9.3p0 (2011-10-30) [i386-mingw32]

Dir.chdir ENV['TEMP']
TMPDIR = Time.now.strftime('%Y%m%d_%H%M%S_delete')
Dir.mkdir(TMPDIR)
Dir.chdir(TMPDIR)

TMPFN  = 'Foo'
File.open(TMPFN, 'w') {}

#----------------------------------------------
p Dir.glob('*')   #=> ["Foo"]  ok
p Dir.glob('f?O') #=> ["Foo"]  ok

# But a glob without special characters returns
#  the glob pattern instead of the filename
p Dir.glob('foO') #=> ["foO"]  not wanted
p Dir['foO']      #=> ["foO"]  same as above
p Dir.glob('foO', File::FNM_CASEFOLD)
                # casefold ignored, as docs say
#----------------------------------------------

File.delete(TMPFN)
Dir.delete(File.join('..', TMPDIR))


#+++++
# Same incorrect results from:
#   ruby 1.8.7p334 (2011-02-18) [i386-mingw32]

Related issues 1 (0 open — 1 closed)

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#1 [ruby-core:42470]

Updated by daz (Dave B) about 12 years ago

This *nix behaviour would be fine, for me.

# ruby 1.8.7p302 (2010-08-16) [i486-linux]
#-----------------------------------------------------
p Dir.glob('*')                        #=> ["Foo"]  ok
p Dir.glob('f?O')                      #=> []       ok
p Dir.glob('foO')                      #=> []       ok
p Dir.glob('foO', File::FNM_CASEFOLD)  #=> ["Foo"]  ok
#-----------------------------------------------------

( Couldn't find an ENV['TEMP'] .. used ENV['HOME'] )

daz

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#2 [ruby-core:42472]

Updated by nobu (Nobuyoshi Nakada) about 12 years ago

Category set to core
Status changed from Open to Feedback
Target version set to 2.0.0

Dave B wrote:

p Dir.glob('foO') #=> ["foO"]  not wanted

What do you want, an empty array same as case-sensitive systems?

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#3 [ruby-core:42473]

Updated by daz (Dave B) about 12 years ago

Hi Nobu,

I expected:

p Dir.glob('foO') #=> ["Foo"]

The current behaviour would be difficult to justify.
The doc string says ...
"Returns the filenames found by expanding pattern ..."

There is no filename "foO"; it exists only as a glob pattern.

Instead of answering the question "Are there files which match this
pattern", it has answered an artificial question "What glob pattern
did I use to search for files"; I already knew the answer to that. ;)

Background:
I'm doing a Windows System Restore from Linux and the registry databases
are not things I want to make subtle changes to.

WINDIR   = '/media/XYSRES/WINDOWS'
CONFIG   = File.join( WINDIR, 'system32', 'config' )
Dir.chdir CONFIG

hives = %w{ system software sam security default }

# Can't do this ...
p HIVES_NO = hives.map {|vn| Dir[vn][0] }
#=> ["system", "software", "sam", "security", "default"]

# Have to do this, instead ...
p HIVES_OK = Dir['*'].delete_if {|fn| !hives.include?(fn.downcase)}
#=> ["default", "SAM", "SECURITY", "software", "system"]